Voltage determines current, and only high voltage has high current.

But only high voltage and high current will not cause harm. For example, most electrostatic discharge voltages are in the thousands of volts, and the current is as high as tens of milliamps or even one ampere, but the time is only a few nanoseconds, which has little impact on the human body. However, if the source of high-voltage electricity can continuously provide large current, such as microwave oven transformer, it is very dangerous to get an electric shock if you are not careful, because this harmful current can be sustained. Compared with ordinary static electricity, lightning lasts for a long time, so the damage caused is huge and there is almost no possibility of recovery.

According to the resources on the Internet, on average, human beings can begin to feel the current of 1 mA, feel pain at 5 mA, feel extreme pain at 15 mA, lose control of muscles at 30 mA, and die directly above 100 mA. Of course, these data are all DC. Alternating current (AC) is complicated, which will cause different injuries due to different frequencies.

Generally speaking, there are two kinds of injuries caused by electric shock: paralysis of nerves and control of muscles to prolong your time under high voltage, and overheating of tissues in the human body due to the thermal effect of current.

Because voltage multiplied by current multiplied by time is energy, electrical injury is related to energy. Of course, the same energy has different effects in different parts.